hey there welcome to life noggin whether
it's the latest scary movie or some
sparkly vampire book blood seems to be
everywhere well probably not real blood
because that'd be gross however one
thing it's not mentioned in a lot of
these stories is blood types what do all
of these letters and plus signs mean
anyway luckily I'm here to help for most
of human history we thought that all
blood was the same in fact it wasn't
until the 20th century that we
discovered that we were wrong when
foreign objects like bacteria or viruses
get into our body your white blood cells
produce antibodies which are like your
own personal army these antibodies
recognize the foreign object which we
call an antigen and attack it the
antibody then attaches itself to the
antigen similar to a lock-and-key which
is what keeps you from getting sick so
there's no reason why any antigens
should still be in your body right well
wrong your red blood cells naturally
contain millions of antigens that your
immune system doesn't react to and the
antigens that you have in those red
blood cells determines your blood type
for example if you have both a and B
antigens your blood type is a B if you
have neither a nor B antigens than you
are a typo additionally if you have type
A blood than you have anti-b antibodies
this is why you have to be careful if
you get a blood transfusion
if you receive someone else's blood
that's a Type B your immune system will
attack that blood thinking it's a
foreign object lastly if you hear the
word positive at the end of your blood
type you have an additional antigen
called the Rh factor a universal blood
donor has none of these antigens which
makes someone with own negative blood
very valuable so what's your blood type
let us know and if not you should go
ahead and ask us a question that you
want answered because it might become a
life noggin video I'm black oh this has
been life noggin I will see you on
Monday with a brand new video
don't forget to keep on thinking